Causes of severe vision loss in a 4 year birth cohort (1984–7) in a geographically defined population of preschool children
| Time of origin of impairment | Diagnosis | No of children |
|---|---|---|
| Prenatal: | Cortical visual impairment | 27 |
| Cataract | 16 | |
| Congenital nystagmus | 10 | |
| Albinism | 9 | |
| Optic atrophy | 8 | |
| Retinal dystrophy | 11 | |
| Anophthalmos/mircrophthalmos | 4 | |
| Colobomata | 4 | |
| Optic nerve hypoplasia | 4 | |
| Severe myopia | 2 | |
| Buphthalmos | 1 | |
| Other: (one each) | ||
| Peters’ anomaly | ||
| Rieger’s | ||
| Moebius syndrome | ||
| Other syndrome | ||
| Total | 100 | |
| Perinatal: | Cortical visual impairment | 23 |
| Retinopathy of prematurity | 9 | |
| Severe myopia (assoc with ROP) | 1 | |
| Optic atrophy | 7 | |
| Total | 40 | |
| Postnatal: | Cortical visual impairment | 10 |
| Optic atrophy | 6 | |
| Retinoblastoma | 1 | |
| Total | 17 | |
| Unclassifiable | 9 |